Figure 2.

Energy band diagram of the electron field emission. (a) Normal and (b) strong applied electrostatic bias fields in a FE nanodiode. The dashed line shows the potential distribution for a FE microdiode, with a distant anode (not shown here) and a very large anode-to-cathode distance.

Cheng et al. Nanoscale Research Letters 2012 7:125   doi:10.1186/1556-276X-7-125
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